| | Buchanan, NY | Irvington, NY | United States |
| Population | 2,236 | 6,594 | 329,725,481 |
| Female Population | 47.1% | 51.6% | 50.5% |
| Male Population | 52.9% | 48.4% | 49.5% |
| Median Age | 41.1 | 38.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,224 | 6,423 | 309,327,143 |
| Population - 2000 | 2,189 | 6,631 | 285,036,114 |
| Population - 1990 | 1,970 | 6,348 | 251,960,433 |
| Pop. 2000 to Now | 1.2% | -3.1% | 15.6% |
| Pop. 1990 to Now | 12.4% | 1.2% | 30.8% |
| space4 | | | |
| Population Density | 1,634.5 | 2,377.9 | 93.4 |
| Land Area | 1.4 | 2.8 | 3,531,905.4 |
| Water Area | 0.3 | 1.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Buchanan, NY | Irvington, NY | United States |
| Age 0 to 4 | 5.5% | 7.8% | 5.9% |
| Age 5 to 9 | 3.2% | 11.9% | 6.1% |
| Age 10 to 14 | 9.0% | 8.0% | 6.6% |
| Age 15 to 17 | 3.5% | 4.3% | 3.9% |
| Age 18 to 20 | 2.1% | 3.1% | 4.0% |
| Age 21 to 24 | 8.6% | 4.3% | 5.2% |
| Age 25 to 34 | 11.7% | 6.5% | 13.8% |
| Age 35 to 44 | 11.3% | 14.1% | 12.9% |
| Age 45 to 54 | 12.7% | 17.5% | 12.6% |
| Age 55 to 59 | 8.5% | 5.7% | 6.7% |
| Age 60 to 64 | 8.6% | 4.9% | 6.3% |
| Age 65 to 74 | 7.7% | 8.4% | 9.6% |
| Age 75 to 84 | 5.2% | 2.6% | 4.5% |
| Age 85 and over | 2.4% | 0.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Buchanan, NY | Irvington, NY | United States |
| White | 69.2% | 81.0% | 59.4% |
| Black | 6.2% | 0.8% | 12.2% |
| Asian | 4.8% | 9.2% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.6% | 3.3% | 3.2% |
| Hispanic | 16.9% | 5.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Buchanan, NY | Irvington, NY | United States |
| Married Population | 55.3% | 67.7% | 49.8% |
| Currently Married | 54.6% | 67.4% | 48.0% |
| Married but Separated | 0.7% | 0.3% | 1.8% |
| Single Population | 44.7% | 32.3% | 50.2% |
| Never Married | 33.5% | 25.5% | 33.8% |
| Divorced | 6.6% | 4.7% | 10.8% |
| Widowed | 4.6% | 2.1% | 5.6% |
| space5 | | | |
| Household Size | 3.03 | 3.10 | 2.60 |
| Households | 733 | 2,109 | 124,010,992 |
| Family Households | 561 | 1,784 | 80,755,759 |
| Married couple, w/children | 42.2% | 57.6% | 30.5% |
| Married couple, no children | 39.6% | 31.4% | 42.9% |
| Non Family Households | 172 | 325 | 43,255,233 |
| Single householder, w/children | 6.1% | 5.5% | 15.8% |
| Single householder, no children | 12.1% | 5.4% | 10.8% |